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CRISPR

CRISPR

Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...

CRISPR/Cas9 Genome Editing

CRISPR/Cas9 Genome Editing

The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...

CRISPR and crRNAs

CRISPR and crRNAs

Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...

Homologous Recombination

Homologous Recombination

The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...

The Antiviral System of Bacteria and Archaea: CRISPR

The Antiviral System of Bacteria and Archaea: CRISPR

CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats is a adaptive immune system found in bacteria and archaea that protects against viral infections. This system enables prokaryotic cells to identify, remember, and neutralize foreign genetic elements, primarily bacteriophages, by storing fragments of the invader’s DNA as a genetic memory.The CRISPR immune response begins during an initial infection. Cas (CRISPR-associated) proteins play a central role in this...

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Related Experiment Video

Updated: Jan 1, 2026

Genome-Wide CRISPR Screen for Unveiling Radiosensitive and Radioresistant Genes

Genome-Wide CRISPR Screen for Unveiling Radiosensitive and Radioresistant Genes

Published on: May 23, 2025

An Exclusive Interview With CRISPR.

Sean C McConnell¹

¹A senior policy analyst at the American Medical Association in Chicago, Illinois.

AMA Journal of Ethics

|December 27, 2019

Summary

This summary is machine-generated.

This article explores the ethical considerations of CRISPR gene editing technology. It discusses patient safety, treatment effectiveness, fair access, and global oversight of genetic advancements.

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Published on: July 1, 2021

Area of Science:

Biotechnology
Bioethics
Genetics

Background:

CRISPR/Cas technology offers revolutionary gene editing capabilities.
Ethical considerations are paramount for responsible innovation in genetic medicine.

Discussion:

Patient safety concerns regarding off-target mutations and long-term effects.
Therapeutic efficacy and the potential for treating genetic diseases.
Equitable access to CRISPR-based therapies and avoiding health disparities.
Global governance frameworks for managing human germline gene editing.

Key Insights:

A dialogue between a physician-scientist and CRISPR highlights critical ethical questions.
Balancing therapeutic potential with patient safety and societal impact is crucial.
Ensuring equitable access and global consensus is vital for responsible gene editing.

Outlook:

Further research is needed to fully understand CRISPR's long-term implications.
Development of robust ethical guidelines and regulatory frameworks is essential.
International collaboration is key to navigating the future of human genetic legacy.